(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | ALTER TABLE. The SQL ALTER TABLE command is used to add, delete or modify columns in an existing table. You should also use the ALTER TABLE command to add and drop various constraints on …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | Indexes. Indexes are special lookup tables that the database search engine can use to speed up data retrieval. Simply put, an index is a pointer to data in a table. An index in a …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | Alias Syntax. You can rename a table or a column temporarily by giving another name known as Alias. The use of table aliases is to rename a table in a specific SQL statement. …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | NULL Values. The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | EXCEPT Clause. The SQL EXCEPT clause/operator is used to combine two SELECT statements and returns rows from the first SELECT statement that are not returned by the second SELECT statement. This means EXCEPT returns only …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | NTERSECT Clause. The SQL INTERSECT clause/operator is used to combine two SELECT statements, but returns rows only from the first SELECT statement that are identical to a row in the second SELECT statement. This …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | UNIONS CLAUSE. The SQL UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use this UNION clause, each SELECT statement must …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | RIGHT JOINS. The SQL RIGHT JOIN returns all rows from the right table, even if there are no matches in the left table. This means that if the ON clause matches 0 (zero) records …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | LEFT JOINS. The SQL LEFT JOIN returns all rows from the left table, even if there are no matches in the right table. This means that if the ON clause matches 0 (zero) records …
(SQL tutorials for Business Analyst & Beginners) In this end-to-end example, you will learn – SQL Tutorials for Business Analyst: SQL | INNER JOINS. The most important and frequently used of the joins is the INNER JOIN. They are also referred to as an EQUIJOIN. The INNER JOIN creates a new result table by combining column …